The designation of manufacturer for the companies "Tri-ang",
"Tri-ang Hornby", "Hornby Railways" and "Hornby" is not easy as some locos were produced under more than one of these labels. I have done my best based on the dates of manufacture.
Tri-ang was used from 1952 to 1964, Tri-ang Hornby from 1965 to 1971, Hornby Railways from 1972 to 1996 and Hornby from 1997 onwards.

Hornby-Dublo was manufactured from 1938 to 1964 and then many of the moulds passed to Wrenn, which lasted from 1968 to 1992, and then later to Dapol.